Stored-Product Insects (SPIs)
Definition
Insects that infest, damage, or develop in stored food commodities, including grains, dried spices, nuts, dried fruits, flour, and processed food products. They are economically important globally and represent a major post-harvest loss category.
- Habitat
- Grains, dried spices, nuts, dried fruits, flour, processed food
- Significance
- Major post-harvest loss category globally
- Field
- Stored-product entomology
Common questions
Why are SPIs economically significant beyond the food safety concern they raise?+
Beyond contaminating individual products, SPIs cause substantial post-harvest crop loss worldwide by damaging stored grain and commodities before they ever reach a consumer, making their control an agricultural and economic priority as well as a forensic one.
What does finding a specific SPI species inside sealed packaging suggest to an investigator?+
Because SPIs generally cannot penetrate intact packaging as adults, finding an internal-feeding species and its developmental stages inside a sealed product points toward contamination before packaging, whereas surface-dwelling species found only outside the product suggest post-packaging entry.
Related terms
- Defect Action Level
- A regulatory threshold set by food safety authorities (the US FDA's Defect Levels Handbook being the most cited) above which insect contamination...
- Hidden Infestation
- Insects developing inside intact grain kernels (as with Sitophilus larvae) or concealed within the product matrix, invisible to surface inspection. Detection requires...
- Infestation Age
- The minimum period an infestation has been established, back-calculated from the oldest (most developed) larval stage present using accumulated temperature data. Gives...
- Primary Pest
- A species that can attack intact, undamaged grain or other commodity by boring through the kernel or product. Grain weevils (Sitophilus spp.)...
- Secondary Pest
- A species that depends on grain already damaged, cracked, or broken open by primary pests or mechanical processing. Flour beetles (Tribolium spp.)...